package com.ymk.service;

import com.alibaba.dubbo.config.annotation.Reference;
import com.ymk.pojo.Permission;
import com.ymk.pojo.Role;
import com.ymk.pojo.User;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

@Component
public class SpringSecurityUserService implements UserDetailsService {

    @Reference//注意；此处要通过dubbo远程调用用户服务
    private UserService userService;

    //根据用户名查询用户信息
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        //远程调用用户服务，根据用户名查询用户信息
        User user = userService.findUserByUsername(username);
        if(user == null){
            //用户名不存在，抛出异常UsernameNotFoundException
            return null;
        }
        List<GrantedAuthority> list = new ArrayList<GrantedAuthority>();
        Set<Role> roles = user.getRoles();
        for (Role role : roles) {
            Set<Permission> permissions = role.getPermissions();
            for (Permission permission : permissions) {
                //授权
                list.add(new SimpleGrantedAuthority(permission.getKeyword()));
            }
        }
        /**
         * User()
         * 1.指定用户名
         * 2：指定密码（SpringSecurity会自动对密码进行校验）
         * 3.传递授予的角色和权限
         */
        UserDetails userDetails = new org.springframework.security.core.userdetails.User(
                username,user.getPassword(),list
        );
        return userDetails;
    }
}
